Revert "Auto merge of #101620 - cjgillot:compute_lint_levels_by_def, r=oli-obk"

This reverts commit 2cb9a65684, reversing
changes made to 750bd1a7ff.

compiler/rustc_lint/src/context.rs

@@ -560,7 +560,7 @@ pub struct LateContext<'tcx> {
 
 /// Context for lint checking of the AST, after expansion, before lowering to HIR.
 pub struct EarlyContext<'a> {
-    pub builder: LintLevelsBuilder<'a, crate::levels::TopDown>,
+    pub builder: LintLevelsBuilder<'a>,
     pub buffered: LintBuffer,
 }